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Biomedical subjects

M Takeda

Publications and source records attributed to M Takeda.

At least 919 records · Page 51Linked to original sources
PubMed1985

A case of hypophyseal prolactinoma with treatable delusions of dermatozoiasis.

The case of an autopsied patient with hypophyseal prolactinoma and dermatozoic delusions is reported, and the mechanism of onset of this special form of delusion is discussed from the neuroendocrinological view point, including response to medications, and neuropathological and pituitary hormonal studies. The subject (69-year-old female) with dermatozoic delusions suffered hypophyseal prolactinoma with high serum prolactin level. Major tranquilizers, minor tranquilizers, or drugs enhancing cerebral blood flow and/or cerebral metabolism did not expell the delusion. Bromocriptine (dopamine agonist) was administered for prolactinoma treatment. After bromocriptine treatment, small doses of haloperidol successfully expelled the delusion. The neuropathological study indicates that the genesis of this delusion is not based on any organic change, but is induced by functional changes related to the prolactin and dopamine systems.

Aged↗
PubMed1985

Sodium salicylate activates cathepsin B but not cathepsin H from rat spleen.

Effect of sodium salicylate (SA) and its analogues on lysosomal cysteine proteinases, cathepsins B and H, was investigated. Using a sensitive fluorometric assay, SA was shown to activate cathepsin B but not cathepsin H in the presence of cysteine. Kinetics data showed that the SA-stimulated reaction was due to a 4.5-fold decrease in Km. SA caused a decrease in the inactivation rate of cathepsin B by leupeptin and E-64. It was suggested that SA stimulates the activation process of the essential cysteine residue.

Animals↗
PubMed1985

Characteristics of activation of cathepsin B by sodium salicylate and comparison of catalytic site properties of cathepsins B and H.

Attempts to gain greater understanding of characteristics of catalytic site properties of two homologous lysosomal cysteine proteinases, cathepsins B and H, were made by using sodium salicylate (SA) and several specific inhibitors, which extends the studies on the structure-activity relationship and kinetics for the activation of cathepsin B by SA in the previous paper (Yamamoto, K., Takeda, M. and Kato, Y.: Japan. J. Pharmacol. 38, 215-218, 1985). The half-maximal activation of cathepsin B by SA was observed at around a molar ratio of 10(4):1 (SA/cathepsin B). No preincubation time was needed for the SA-stimulated reaction, but the rate of activation was more rapid as pH values in the preincubation mixture decreased. The extent of inactivation of cathepsin B by leupeptin and E-64 significantly decreased in the presence of SA. Catalytic site properties of cathepsins B and H were also distinguished by differences in the extent of inhibition by cysteine proteinase inhibitors. Cathepsin B was more sensitive than cathepsin H to inhibition by antipain, chymostatin, iodoacetic acid and mercuric chloride as well as leupeptin and E-64. Despite the similarity in inhibitory effects of iodoacetic acid and E-64, the rat spleen cathepsin H was characterized by insensitivity to mercuric chloride that had a considerable inhibitory effect on the corresponding enzyme from rat liver and the rat spleen cathepsin B.

Animals↗
PubMed1985

Inclusion compounds of lankacidin-group antibiotics with cyclodextrins.

Lankacidin-group antibiotics formed inclusion compounds with beta-cyclodextrin in molar ratios of about 1:1. These compounds showed remarkably improved water-solubility and stability in aqueous solutions. The structure of the inclusion compounds of lankacidin A is proposed based on the facility of their inclusion with beta-cyclodextrin and the results of 1H NMR spectral studies.

Anti-Bacterial Agents↗
PubMed1985

[Effect of anticancer agents on rat prostate. Evaluation of organ weight, histological finding and 5 alpha-reductase activities].

To evaluate the effect of anticancer chemotherapeutic antigens on rat prostate, ten kinds of anticancer agents corresponding to the dose generally used for humans were intraperitoneally injected to 63-day-old Wistar rats. The anticancer agents were administered as follows: Cyclophosphamide (CPM) was used at the dose of 8 mg/kg for 7 days. Methotrexate (MTX), actinomycin-D (ACD) and cis-platinum (CDDP), 163 micrograms/kg, 8 micrograms/kg and 833 micrograms/kg for 5 days, respectively. Nitrogen mustard (NM), bleomycin (BLM), peplomycin (PLM), adriamycin (ADM), vincristine (VCR), and vinblastine (VBL), 500 micrograms/kg, 250 micrograms/kg, 170 micrograms/kg, 2.5 mg/kg, 33 micrograms/kg and 83 micrograms/kg, twice in a week, respectively. The rats were killed on the fifth day after completion of the schedule. Then, the weight of the body, the prostate, the epididymis and the adrenal gland were measured. In addition, 5 alpha-reductase activities and histological findings in the prostate were examined. For determination of 5 alpha-reductase activities, cell-free homogenate obtained from the rat ventral prostate was incubated with C14-testosterone at 37 degrees C for 30 minutes in an atmosphere of 95% of O2 and 5% of CO2. Subsequently, the metabolites from testosterone were separated and purified with thin layer chromatography using the solvent system with benzene acetone, 4:1 (v/v). 5 alpha-Reductase activity was determined with the sum of dihydrotestosterone (DHT) and androstanediol converted from testosterone and indicated as pmol product/mg protein. The 5 alpha-reductase activity was employed as a biological marker for the degree of androgenic dependency in the prostate. The results were summarized as follows. CDDP significantly reduced the weight of the body (p less than 0.001, n = 7), but not the activity of 5 alpha-reductase. NM and VBL had a specific action to reduce the weight of the prostate (p less than 0.01, n = 8) without causing loss of body weight. NM and VBL showed no influence on 5 alpha-reductase activities. The activity of 5 alpha-reductase was markedly damaged by BLM (p less than 0.05, n = 6) and PLM (p less than 0.05, n = 5). However no significant reduction was recognized in the weight of the body and the prostate. CPM, MTX, ACD, ADM and VCR were ineffectual on the body and the prostate weight and 5 alpha-reductase activities. In the histological examination, atrophy and degeneration of the glandular epithelium were revealed in the prostate treated with NM, VBL and CDDP.(ABSTRACT TRUNCATED AT 400 WORDS)

Animals↗
PubMed1985

[Changes in Y-protein and ligandin in human liver tumor tissues].

Since the relationship between tissue ligandin and liver tumors has not been studied yet, we investigated the changes of Y protein and ligandin in human hepatoma and cholangioma by gel filtration, BSP-affinity chromatography, and SDS-gel electrophoresis. The concentration of Y protein was markedly increased in both hepatoma and cholangioma, 2.8 and 4.8 times that of control, respectively. The content of ligandin was also increased in both conditions. SDS polyacrylamide gel electrophoresis of the increased ligandin confirmed the increment of 2.3 K dalton protein, which coincided with the MW of the ligandin subunit. Although the mechanism of the ligandin increase in hepatoma tissue is not clear, one possible reason might be due to the degree of differentiation of the tumor cells. In our case, the pathological examination revealed that the tumor cell was classified as Edmondoson Type II.

Adenoma, Bile Duct↗
PubMed1985

Preretinal and retinal hemorrhage due to chronic subdural hematoma.

A case report of a 58-year-old man with preretinal and retinal hemorrhages due to chronic subdural hematoma is presented. Three weeks after head injury in a motor vehicle accident, a few peripapillary retinal hemorrhages with slightly blurred margins of the optic disk were seen in both eyes; subretinal and preretinal hemorrhages developed subsequently. Computed tomography revealed right frontal subdural hematoma, though there were no neurologic findings. Preretinal hemorrhages associated with subdural hematoma are uncommon in adults, and no photographic evidence of such hemorrhages has been published. The patient was treated nonsurgically, and the ocular hemorrhages resolved gradually.

Hematoma, Subdural↗